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Thanks Thomas for your post, it helped me too, but there is one more thing i still would like to understand, in the question rascal asked for running a rostopic echo from a launch, you answered that.

But notice in the question example rascal used a filename output specification (for directory and file name), for example i can use:

$rostopic echo /fix>/home/user/directory/filename.txt

and it will write the messages in the specified directory, is there any way I can run the rostopic echo from a launch like the one you gave, but specifing also the output file directory?

Thank you very much,

Pablo Payno

Thanks Thomas for your post, it helped me too, but there is one more thing i still would like to understand, in the question rascal asked for running a rostopic echo from a launch, you answered that.

But notice in the question example rascal used a filename output specification (for directory and file name), for example i can use:

$rostopic echo /fix>/home/user/directory/filename.txt

and it will write the messages in the specified directory, is there any way I can run the rostopic echo from a launch like the one you gave, but specifing also the output file directory? Personally I would like to output addicional messages with output="screen" and output topic messages in the .txt file specified in the directory but im not able to find the way to output the file in a specified directory

Thank you very much,

Pablo Payno